. OOTDTY Features: Made of high-quality plastic and electronic components, it is sturdy, sturdy, , anti-corrosion and good performance. This probe is mainly used to measure pH, which is either the concentration of hydrogen ions in an aqueous solution or the activity of hydrogen ions in an aqueous solution. High precision that can give almost instant readings, accurate and reliable. It can indicate whether the solution is acidic or basic, and then you can adjust the concentration of the solution as you like. A single cylinder can be used with a PH meter, controller, or any PH device that has a BNC input terminal. Suitable for aquarium, hydroponics, laboratory, etc. PH electrode only, other accessories demo in the picture are not included! Specification:Material: Plastic, Electronic Components Size: app.14 x 1.2cm/5.51 x 0.47inColor: Random Delivery (If you buy more than one, the colors you get will be the same or different.)Quantity: 1 PcNote: No retail package. Please allow 0-1cm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Included:1 x PH Electrode Probe